Projection lens

A projection lens and lens technology, applied in the field of projection lenses, can solve the problems of increasing optical aberrations and difficulty in correcting aberrations, etc.

Inactive Publication Date: 2013-04-24
CORETRONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large projection angle will greatly increase the optical aberration, so it will become difficult to correct the aberration in the optical design

Method used

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Embodiment Construction

[0026] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed descriptions of multiple embodiments in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate, not to limit, the invention.

[0027] figure 1 It is a schematic diagram of a projection lens according to an embodiment of the present invention. Please refer to figure 1 , the projection lens 100 of the present embodiment includes a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 and a fifth lens 150 arranged in sequence from the enlargement side to the reduction side. The diopters of the first lens 110 , the second lens 120 , the third lens 130 , the fourth lens 140 and the f...

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Abstract

A projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the enlargement side to the diminution side. Diopter of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is respectively negative, negative, positive, negative and positive. The diopter of the fourth lens is larger than that of the first lens and the second lens. Refractive index of the fourth lens is Nd and focal length of the fourth lens is f4. The focal length of fifth lens is f5. Due to the fact that the projection lens meets 0.45<|f4/ (f5*Nd)|<1.2, the projection lens has the advantages of being good in imaging quality and small in size.

Description

technical field [0001] The invention relates to a lens, and in particular to a projection lens. Background technique [0002] With the advancement of technology, Pico Projection Lens has gradually become one of the mainstream in the market. The main market of micro-projection lenses is positioned in portable personal electronic products, so low price has also become an important factor. In addition, an important feature of the pico projector is that the light source is changed from the traditional high-pressure mercury lamp (UHP) to an environmentally friendly and power-saving light-emitting diode light source. However, it is hoped to maintain high brightness while reducing the size, which means that the lens has a smaller numerical aperture (F number), generally 2.4. In order to obtain higher luminous flux, the numerical aperture must be reduced, and using a large aperture lens is another effective method. However, as the aperture becomes larger, the lens becomes relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00
Inventor 廖陈成
Owner CORETRONIC
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